Year	% of cohort
1960	65.96905
1961	65.48841
1962	63.321406
1963	65.374162
1964	67.622122
1965	66.639467
1966	66.771993
1967	66.21252
1968	65.72389
1969	64.578763
1970	63.975326
1971	65.446937
1972	63.889256
1973	64.608786
1974	64.366812
1975	62.99554
1976	62.833565
1977	62.441359
1978	61.671103
1979	61.006241
1980	60.547443
1981	60.77692
1982	61.387663
1983	60.763418
1984	59.340414
1985	59.366316
1986	63.220809
1987	62.446325
1988	61.877392
1989	61.122475
1990	59.975014
1991	58.335975
1992	57.739688
1993	53.93303
1994	53.06943
1995	54.217115
1996	56.21469
1997	58.013517
1998	58.694955
1999	59.172792
2000	60.154856
2001	58.701193
2002	58.725044
2003	59.016992
2004	59.22667
2005	57.434935
2006	57.029082
2007	56.232534
2008	59.007659
2009	60.911651
2010	61.693722
2011	62.880101
2012	63.755857
2013	64.1762
2014	65.70841
2015	65.712664
2016	66.470718
2017	68.504176
2018	69.367732
2019	70.667598
2020	67.891255
2021	65.538032
2022	66.8386